<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh+'px'}">
        <block v-for="(item,i) in cateList" :key="item.cat_id">
          <view class="left-scroll-item " :class="{'active':i===active}" @click="changeIndex(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">
            /{{item2.cat_name}}/
          </view>
          <view class="cate-lv2-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key='i3'  @click="gotoGoodsList(item3)">
              <image class='item3-img' :src="item3.cat_icon" mode=""></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/minxins/tabbar-badge.js';
  	export default {
     mixins:[badgeMix],
    data() {
      return {
        // wh 当前屏幕的可用高度
        wh: 0,
        // 分类数据的列表
        cateList: [],
        // 二级分类列表
        cateLevel2: [],
        scrollTop: 0,
        active: 0
      };
    },
    onLoad() {
      this.getWH()
      this.getCateList()

    },
    methods: {
      getWH() {
        const sysInfo = uni.getSystemInfoSync()
        this.wh = sysInfo.windowHeight - 50
      },
      // 获取分类数据列表
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        console.log(res)
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        // 为二级分类赋值 这步骤在点击切换的时候去赋值,但是这里需要一开始赋值,不然一开始会没有数据
        this.cateLevel2 = res.message[0].children
      },
      changeIndex(i) {
        this.active = i
         // 可以简化为如下的代码：
          this.scrollTop = this.scrollTop ? 0 : 1
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
      },
      gotoGoodsList(item3) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;
    }
  }

  .left-scroll-item {
    background-color: #f7f7f7;
    line-height: 60px;
    text-align: center;

    &.active {
      background-color: #fff;
      position: relative;

      &::before {
        content: '';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #c00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: 600;
    text-align: center;
    padding: 15px 0;
  }

  .item3-img {
    width: 60px;
    height: 60px;
  }

  .cate-lv2-list {
    // border: 1px solid pink;
    display: flex;
    flex-wrap: wrap;
  }

  .cate-lv3-item {
    width: 33.33%;
    // border: 1px solid red;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 12px;
    margin-bottom: 10px;
  }
</style>
